Passage Two Questions 30 to 32 are based on the passage you have just heard.
A. Intelligence section.
B. Cargo transfers on airplanes.
C. Telecommunication hardware moving.
Data collecting techniqu
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He said there were a few points in the essay ______ (他发现难以理解).
______ (到了有关当局采取措施的时候) solve traffic problems.
Passage Three Questions 33 to 35 are based on the passage you have just heard.
A. They lose water constantly.
B. They contain a relatively lower concentration of salt.
C. They neither lose nor absorb water.
D. They possess a relatively higher concentration of salt.
Questions 23 to 28 are based on the conversation you have just heard.
A. Flies need less sleep than humans.
B. Humans need a similar amount of sleep with flies.
C. The amount of human sleep is determined by certain gene.
D. Flies can determine how much sleep they nee
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